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Results tagged with list-manipulation
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user 2000
Questions on the manipulation of List objects in Mathematica, and the functions used for these manipulations.
4
votes
2
answers
239
views
Simpler way to repeat an execution with 2D points?
q has the coordinates of quadrilateral. I can get the output below with brute-force but I want to find a simpler solution, perhaps something like f<-q[[1;;2]].
Initializations
f[x_, y_] = {{1, 2}, { …
- 2,633
-2
votes
1
answer
116
views
Suppressing Null output with sparse data? A lot of zeros and little nonzeros
I have sparse situation with a lot of zeros, related chat. I want to see only the nonzero things or nonnull things.
Example
Input
hello[ii_, jj_] := If[ii == 1, Return[True], Return[False]]
Tabl …
- 2,633
4
votes
2
answers
933
views
Deleting vertices from a Graph and preserving structure
My goal is to remove vertices from graphs (and the edges from them) and then take GraphComplement to find out cut sets in graphs with sink and source such as here. So
How can I delete vertices from a …
- 2,633
2
votes
Accepted
Deleting vertices from a Graph and preserving structure
The solution for the GridGraph here. You need to fix the VertexCoordinates before deletions.
G = SetProperty[G, VertexCoordinates -> GraphEmbedding[G]];
VertexDelete[G, deleteMe]
- 2,633
2
votes
3
answers
1k
views
Matlab-style Find in Mathematica? Value list and Boolean List, how to select values accordin...
I want to select elements with the true value (Indices list) in the corresponding point to the value list (MCS). Is there anything like Matlab-style Find to get the indices of true values in the boole …
- 2,633
5
votes
Accepted
Matlab-style Find in Mathematica? Value list and Boolean List, how to select values accordin...
As Rojo suggested, Pick works -- yet there may be other solutions.
- 2,633